4.S 



EXPERIMENTS ON TURNIPS. 



[Appendix^ 



The above result is favourable to guano, considering that it was applied in 

 such small quantity ; but why did the saline manures produce no effect — was 

 it because of the drought of the season, or was it because Mr. Campbell's land 

 is already amply supplied with salts of soda from its vicinity to the sea'? (see 

 Lectures, pp. 344and34G). These experiments are not unworthy of repetition 

 on a larger scale. 



II. Some very striking results, obtained by top-dressing potatoes with saline 

 manures on a small scale, were described by ivlr. f'leming, of Barochan, in 

 1841, and are recorded in the preceding part of this Appendix (p. 20). The 

 following three series of experiments, made under the direction and superin- 

 tendence of the same gentleman, have been made upon a larger scale, and with 

 the view of throwing light upon a greater number of interesting points — 



The object of the first series was to ascertain the effect — 



1°. Of (li[;'erent mixed manure:^, when applied alone to the potato crop. 



^°. Their relative effects on diffei'ent varieties of potato. 



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